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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7929ff6faedbb49a16ed4266872e8eb642eebcc25f8adda5b7ac5f389f75ec89' 
  AND token = 'TyMrVYONs+e+e48PkMhUz+o0m+RFUDIT43hzGz3K7W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}